Mises moves beyond economics to address questions regarding the foundation of all social science. He discusses his methodological dualism: one approach for hard sciences and another for the social sciences. Rothbard writes "It is Mises's great methodological work, explaining the basis of his approach to economics, and providing scintillating critiques of such fallacious alternatives as historicism, scientism, and Marxian dialectical materialism." This audiobook is narrated by John Pruden, and is also available on Soundcloud.